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Subject[PATCH 17/43] spi: ep93xx: add DT support for Cirrus EP93xx
Date
- find register range from the device tree
- provide clock access via of
- use_dma as a DT node

Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me>
---

Notes:
Arnd Bergmann:
- wildcards ep93xx to something meaningful, i.e. ep9301
- drop wrappers

drivers/spi/spi-ep93xx.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index 5896a7b2fade..b37be7109161 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -22,6 +22,7 @@
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/scatterlist.h>
@@ -644,6 +645,25 @@ static void ep93xx_spi_release_dma(struct ep93xx_spi *espi)
free_page((unsigned long)espi->zeropage);
}

+#ifdef CONFIG_OF
+static struct ep93xx_spi_info dt_spi_info;
+
+static struct ep93xx_spi_info *ep93xx_spi_get_platdata(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+
+ if (np && of_property_read_bool(np, "use_dma"))
+ dt_spi_info.use_dma = 1;
+
+ return &dt_spi_info;
+}
+#else
+static struct ep93xx_spi_info *ep93xx_spi_get_platdata(struct platform_device *pdev)
+{
+ return dev_get_platdata(&pdev->dev);
+}
+#endif
+
static int ep93xx_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
@@ -653,7 +673,7 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
int irq;
int error;

- info = dev_get_platdata(&pdev->dev);
+ info = ep93xx_spi_get_platdata(pdev);
if (!info) {
dev_err(&pdev->dev, "missing platform data\n");
return -EINVAL;
@@ -726,6 +746,8 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
/* make sure that the hardware is disabled */
writel(0, espi->mmio + SSPCR1);

+ master->dev.of_node = pdev->dev.of_node;
+
error = devm_spi_register_master(&pdev->dev, master);
if (error) {
dev_err(&pdev->dev, "failed to register SPI master\n");
@@ -755,9 +777,16 @@ static int ep93xx_spi_remove(struct platform_device *pdev)
return 0;
}

+static const struct of_device_id ep93xx_spi_of_ids[] = {
+ { .compatible = "cirrus,ep9301-spi" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ep93xx_spi_of_ids);
+
static struct platform_driver ep93xx_spi_driver = {
.driver = {
.name = "ep93xx-spi",
+ .of_match_table = ep93xx_spi_of_ids,
},
.probe = ep93xx_spi_probe,
.remove = ep93xx_spi_remove,
--
2.39.2
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